fix(critical): auto-install + activate discovered plugins in prestart.sh

New plugins (self_improvement, knowledge) were discovered but never activated
in the production DB. prestart.sh now auto-installs and activates all
discovered builtin plugins on every container start.

prestart.sh

@@ -107,6 +107,37 @@ python3 /app/scripts/sync_plugin_schema.py
 echo "[prestart] Seeding admin user if not exists..."
 python3 /app/scripts/seed_admin.py || echo "[prestart] WARNING: Admin seed failed (may already exist)"
 
+echo "[prestart] Auto-installing and activating discovered plugins..."
+python3 -c "
+import asyncio
+from app.plugins.registry import get_registry
+from app.core.db import async_session_factory
+from sqlalchemy import select
+from app.models.plugin import Plugin as PluginModel
+
+async def auto_activate_plugins():
+    r = get_registry()
+    discovered = r.discover_builtins()
+    async with async_session_factory() as db:
+        for name in discovered:
+            result = await db.execute(select(PluginModel).where(PluginModel.name == name))
+            record = result.scalar_one_or_none()
+            try:
+                if record is None:
+                    await r.install(db, name)
+                    await r.activate(db, name)
+                    print(f'[prestart] Installed + activated plugin: {name}')
+                elif not record.active:
+                    await r.activate(db, name)
+                    print(f'[prestart] Activated plugin: {name}')
+            except Exception as e:
+                print(f'[prestart] WARNING: Could not activate plugin {name}: {e}')
+        await db.commit()
+    print('[prestart] Plugin auto-activation complete.')
+
+asyncio.run(auto_activate_plugins())
+" || echo "[prestart] WARNING: Plugin auto-activation failed"
+
 echo "[prestart] Starting uvicorn on 0.0.0.0:8000 (workers=1)..."
 exec uvicorn app.main:app \
     --host 0.0.0.0 \